Long-Term Risk Assessment of Levee Cutoff Walls-Presentation Video

Video Transcription

Video Summary

The speaker from ERDC discussed aging levee cutoff walls and the challenge of assessing their long-term risk in USACE infrastructure. The study, supported by the Lower San Joaquin River Levee Improvement Project, reviewed known deterioration and failure mechanisms such as seismic cracking, drying, chemical degradation, vegetation and root intrusion, animal burrows, piping, joint/window failures, and slope instability. Most current assessments rely on surface inspections and limited short-term piezometer data, leaving major uncertainty about conditions deep below ground. Simulations showed that some cutoff walls remain effective even if their hydraulic conductivity degrades, but performance depends heavily on site-specific geometry and design details. The main takeaway was that cutoff walls are not automatically safe forever; agencies need better documentation, data management, and monitoring of existing walls, especially as experienced engineers retire. Future work includes improving databases, modeling degradation more precisely, and coring older walls to verify actual field conditions.

Keywords

levee cutoff walls

long-term risk assessment

deterioration mechanisms

hydraulic conductivity

USACE infrastructure